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Leases Lease costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Leases [Abstract]      
Fixed lease cost $ 812    
Variable lease cost 143    
Short-term lease cost 53    
Total operating lease cost 1,008    
Assets and Liabilities, Lessee [Abstract]      
Operating lease ROU asset 10,700   $ 11,300
Operating lease liabilities- current 2,025    
Operating lease liabilities- noncurrent 8,770    
Total operating lease liability $ 10,795    
Weighted-average remaining lease terms - operating leases (years) 4 years 8 months 16 days    
Weighted-average discount rate - operating leases ( as a percent) 7.02%    
Operating cash flows from operating leases $ 732    
Right-of-use assets obtained in exchange for lease obligations $ 11,314 $ 0